VBOs & Textures
- Re-examine the current approach to rendering and explore alternatives, including:
- Vertex Arrays
- Indexed Vertex Arrays
- VBO
- Introduction to Textures.
- Loading textures from image files
- Binding textures to surfaces
Objectives
- Factor out the current Geometry class into an abstract base class and an ImmediateGeometry that encapsulates current functionality
- Derive a new class - VaGeometry - which uses Vertex Arrays
- Derive another class - ElementGeometry - which uses indexed Vertex Arrays
- Derive a class from ElementGeometry called VboGeometry which employs Vertex Buffer Objects
- Instrument all of these classes to track number of vertices rendered
Objectives
- Incorporate image based textures onto the surface of some actors.
- Using the Soil open source opengl imaging library:
- Load images onto the faces of a cube
- Define a sphere using OpenGL Quadrics - and map a planetary surface onto it such that it is not distorded
- As an exercise, explore loading multiple images/textured onto a singe cube
